#!/bin/bash

[ -f testing.sh ] && . testing.sh

#testing "name" "command" "result" "infile" "stdin"

BIGTEST="one\ntwo\nthree\nfour\nfive\nsix\nseven\neight\nnine\nten\neleven\n"
echo -ne "$BIGTEST" > file1
testing "tail" "tail && echo yes" "oneyes\n" "" "one"
testing "tail file" "tail file1" \
	"two\nthree\nfour\nfive\nsix\nseven\neight\nnine\nten\neleven\n" "" ""
testing "tail -n in bounds" "tail -n 3 file1" "nine\nten\neleven\n" "" ""
testing "tail -n out of bounds" "tail -n 999 file1" "$BIGTEST" "" ""
testing "tail -n+ in bounds" "tail -n +3 file1" \
	"three\nfour\nfive\nsix\nseven\neight\nnine\nten\neleven\n" "" ""
testing "tail -n+ outof bounds" "tail -n +999 file1" "" "" ""
testing "tail -c in bounds" "tail -c 27 file1" \
	"even\neight\nnine\nten\neleven\n" "" ""
testing "tail -c out of bounds" "tail -c 999 file1" "$BIGTEST" "" ""
testing "tail -c+ in bounds" "tail -c +27 file1" \
	"x\nseven\neight\nnine\nten\neleven\n" "" ""
testing "tail -c+ out of bonds" "tail -c +999 file1" "" "" ""
rm file1

testing "tail stdin no trailing newline" "tail -n 1 - " "c" "" "a\nb\nc"
testing "tail file no trailing newline" "tail -n 1 input" "c" "a\nb\nc" ""

optional TAIL_SEEK
testing "tail noseek -n in bounds" "tail -n 3" "nine\nten\neleven\n" \
	"" "$BIGTEST"
testing "tail noseek -n out of bounds" "tail -n 999" "$BIGTEST" "" "$BIGTEST"
testing "tail noseek -n+ in bounds" "tail -n +3" \
	"three\nfour\nfive\nsix\nseven\neight\nnine\nten\neleven\n" "" \
	"$BIGTEST"
testing "tail noseek -n+ outof bounds" "tail -n +999" "" "" "$BIGTEST"
testing "tail noseek -c in bounds" "tail -c 27" \
	"even\neight\nnine\nten\neleven\n" "" "$BIGTEST"
testing "tail noseek -c out of bounds" "tail -c 999" "$BIGTEST" "" "$BIGTEST"
testing "tail noseek -c+ in bounds" "tail -c +27" \
	"x\nseven\neight\nnine\nten\neleven\n" "" "$BIGTEST"
testing "tail noseek -c+ out of bonds" "tail -c +999" "" "" "$BIGTEST"

makebigfile()
{

  for j in $(seq 1 100)
  do
    printf "%s " $j
    for i in $(seq 1 100)
    do
      printf %s 123456789abcefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ
    done
    echo
  done
}
makebigfile > bigfile

testing "tail -c 12345 -n 3 bigfile" "tail -c 12345 -n 3 bigfile | md5sum" \
  "347bbdcbad8a313f4dc7bd558c5bfcb8  -\n" "" ""
testing "tail -n 3 -c 12345 bigfile" "tail -n 3 -c 12345 bigfile | md5sum" \
  "1698825a750288284ec3ba7d8a59f302  -\n" "" ""
